William m



UNITED STATES ATENT OFFICE.

WILLIAM M. HENDERSON, OF BALTIMORE, MARYLAND.

PUMP.

Specification forming part of Letters Patent No. 25,642, dated October 4, 1859; Ressued November 8, 1859, No. 848.

To all whom 'it may concern:

Be it known that I, IVILLIAM M. HENDER- SON, of Baltimore city and State of Maryland, have invented a new and useful Im provement in Double-Acting Force-Pumps; and I do hereby declare the following to be a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing, making a part of this speciii cation, in which- Figure l is a longitudinal section; and Fig. 2 a transverse section through the middle of the pump, with the air vessel in elevation.

The object of this improvement is to simplify the construction and operation of pumps, by certain combination ot' valves, pistons and water ways, causing a contini ous How of water in the same direction, as hereinafter more fully described.

A is the pump barrel; B, B, the hea-ds; C, C', the discharge passages leading to, D, the air vessel, and governed by, E, a double acting discharge valve.

F is the discharge, and G the suction pipe.

H is the plunger, formed ot' two brass cages, screwed onto the extremities of a central tube, which is slotted to allow of the free passage ot' the water to the suction valves I, I', situated within said cages.

J is the attached V)iston rod.

The water enters y the suction pipe into the space between the cages, and when the plunger is moved into the position shown on the drawing, it forces open the suction valve I', filling the space at that end of the barrel, when the plunger moves in the direction indicated by the arrow. The valve I is forced back to its seat by the created pressure on the water, which is driven along the passage C', forcing the discharge valve, C, from the one seat to the other, opening a communication between that end of the barrel, and thc air vessel, and by the same operation closing the other. At the same time the water from the suction pipe forces open the other suction valve I by the created vacuum, and fills the other end ot' the barrel, in readiness for the return stroke, which being continued, will cause the water to low in a steady stream from the discharge pipe.

The plunger and suction valves are readily got at by removing the head B, as also the discharge Valve by removing the air vessel. The plunger it will be observed has no packing, which in other pumps is a continued source of trouble, the turned part of the cages answering every purpose; the valves used are of vulcanized india rubber, which are not likely to get out of order, the seats merely requiring to be countersunk to Suit them.

Having thus described my improvement on double acting force pumps, what I claim as of my invention, and desire to secure by Letters Patent, is

The two ball valve cages, with the suction valves in their interior attached to the extremity of a central perforated tube, or its equivalent, in combination with the water ways, and discharge valve, when constructed and operated substantially in the manner and for the purposes set forth.

Baltimore July 19th 1859.

WILLIAM M. HENDERSON.

Witnesses:

JOHN B. RAY, DANL. ETTREN. 

